月の大気 月面の構成と隕石の衝突が,月の外層におけるナトリウムとカリウムをどのように媒介するのか
A Colaprete1, M Sarantos2, D H Wooden3
1Space Science Division, NASA Ames Research Center, Moffett Field, Mountain View, CA, USA. anthony.colaprete-1@nasa.gov.
まとめ
月の外層のナトリウムとカリウムは 異なるサイクルと変化を示しています 隕石の衝突と地表の組成は,これらの元素,特にKREEP領域のカリウムに強い影響を及ぼします.
科学分野:
- 月科学
- 惑星の大気
- エクソスフィアの構成
背景:
- ナトリウムとカリウムは 月の外層の微量ガスです
- その明るい線放射は 簡単に観測できます
- 以前の研究では 変化が示唆されていましたが 継続的なデータはありませんでした
研究 の 目的:
- 月外大気中のナトリウムとカリウムの時間的および空間的変動を分析する.
- 隕石の影響と地表の構成を 調べるため
- これらの元素の月日 (月間) と年周期を調査する.
主な方法:
- 月の大気と塵環境探査機 (LADEE) の紫外線と可視光譜計 (UVS) のデータを利用した.
- カリウムとナトリウムの連続測定を分析した.
- KREEP領域を含む月面の組成と相関するエクソスフィアの豊富さ.
主要な成果:
- 月面のナトリウムとカリウムに 明確な時間的・空間的変化が観測されました
- 両種に月間周期と,ナトリウムに年間周期を特定した.
- カリウムの測定は,KREEP領域における繰り返し可能な変動と強化を明らかにし,表面組成に依存していることを示した.
結論:
- 隕石の爆撃と地表の組成は,月のエクソスフィアの変動の主要な要因です.
- カリウムの分布は,KREEPのような特定の表面特性に強く関連しています.
- 継続的なモニタリングは 外気圏の動力学と 月面の相互作用に関する 重要な洞察を提供します
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